<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>语句块的练习</title>
</head>
<body>
        <script>
            {
                var arr ='xiao';
                var age ='20';
                console.log(arr);
                console.log(age)
            }
        </script>
</body>
</html>